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Sustained-release gel-breaking type fracturing propping agent and preparation method thereof
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A fracturing proppant and proppant technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well parts, etc., to achieve the effect of reducing fragmentation, high strength and ensuring stability
Active Publication Date: 2012-09-26
CHINA NAT OFFSHORE OIL CORP +2
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[0009] At present, there are no related reports on slow-release gel-breaking fracturing proppants that can slow-release gel-breaking and reduce proppant breakage.
Method used
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[0071] (1) after weighing 60g of ammonium persulfate and 240g of silicon dioxide powder, pulverized and mixed, for subsequent use;
[0072] (2) take by weighing 25g of acrylic resin and dissolve in 500mL of ethanol, to prepare 5% acrylic resin ethanol solution for subsequent use;
[0073] (3) Weigh 1kg of 20-40 mesh ceramsite and place it on the turntable of the granulator;
[0074] (4) Turn on the granulator, adjust the rotating speed of the turntable to be 100rpm, and the blast frequency to be 10HZ;
[0075] (5) Sprinkle powder (mixed powder of ammonium persulfate and silicon dioxide) while spraying liquid (acrylic resin ethanol solution) (use a duster to spread the powder evenly);
[0076] (6) the coated sample is crossed with a 40 mesh sieve, and the uncoated fine powder is sieved;
[0077] (7) The final sample was dried in a 35°C oven for 0.8 h to obtain a drug-loaded intermediate.
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Abstract
The invention discloses a sustained-release gel-breaking type fracturing propping agent for fracturing an oilfield. The propping agent sequentially comprises a base material, a medicament carrying layer and a sustained release layer from inside to outside, wherein the medicament carrying layer comprises a gel breaking agent and a filling agent, and the sustained release layer comprises a film forming material and a pore forming agent. The invention further provides a preparation method of the sustained-release gel-breaking type fracturing propping agent. In an actual application, the sustained-release gel-breaking type fracturing propping agent disclosed by the invention can enter the stratum along with fracturing fluid, and the gel breaking agent can be released slowly under the stratum conditions; and as the propping dosage is great, the gel breaking agent is distributed uniformly, and gel breaking can be realized to the greatest extent. Simultaneously, a chemical material coating the gel breaking agent can be stilly firmly coated on matrix particles, thus the problems of breaking, reflux and stratum embedding of the propping agent can be reduced.
Description
technical field [0001] The invention relates to a slow-release gel-breaking type fracturing proppant for oil field fracturing and a preparation method thereof. Background technique [0002] Due to factors such as the amount and order of addition of gel breakers (persulfate, enzymes, capsule breakers, slow-release acids, etc.) currently used in the fracturing fluidsystem, the fracturing fluid cannot completely and uniformly break the gel, leaving dead corners and stagnation. Part of the residual glue and filter cake leads to a decrease in fracture conductivity; in addition, common proppants are easy to break, flow back and embed into the formation under high closing pressure, which leads to a decrease in fracture conductivity and affects the fracturing effect. [0003] Chinese patent CN1984769A discloses a surface-modified oil and gas well hydraulic fracturing proppant that improves wettability, alters chemical reactivity, alters surface topography, imparts lubricity, or con...
Claims
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Application Information
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